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Beginner : Xtext help [message #699742]

Fri, 22 July 2011 08:31

Arun

Messages: 26
Registered: July 2011

Junior Member

Hi,

One of the rule in my model as follows,

MessageConfig:

"MessageConfig" name=ID "{"
(messageSourceConfig+=MessageSourceConfig)*
"}"
;

MessageSourceConfig:
"MessageSourceConfig" name=ID "sends (a) message(s) {"
(("via port" portname+=ID)? "to the destination(s)" destination+=ID (',' destination+=ID)* "of type" (dmsType+=DMSTYPE)* (',' dmsType+=DMSTYPE)* "managed by" (providerType+=ProviderType)* (',' providerType+=ProviderType)* )*
"}"
;

DMSTYPE:
TOPIC | QUEUE;

TOPIC:
name="topic";

QUEUE:
name="queue";

ProviderType:
LOCAL | SQLDMS;

LOCAL:
name="local";

SQLDMS:
name="sqldms";

When i write a rule in editor , im getting duplicate rule id,

MessageConfig TestConfig {

MessageSourceConfig TestSource sends (a) message(s) {

via port normal to the destination(s) normalmsgtpoic,emergencymdgtopic of type queue,topic managed by sqldms,local

via port emergency to the destination(s) normalmsgtpoic,emergencytopi of type topic managed by sqldms
}

Error:
Duplicate DMSType topic and Duplicate ProviderType sqldms.

kindly help on this.

Thanks,
Arun

}

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Re: Beginner : Xtext help [message #699748 is a reply to message #699742]

Fri, 22 July 2011 08:48

Alexander Nittka

Messages: 1193
Registered: July 2009

Senior Member

Hi,
these rules do not really make sense. E.g. every time you use TOPIC a topic object with name "topic" is created, no wonder there are duplicate elements.

DMSTYPE:
TOPIC | QUEUE;

TOPIC:
name="topic";

QUEUE:
name="queue";

ProviderType:
LOCAL | SQLDMS;

LOCAL:
name="local";

SQLDMS:
name="sqldms";

If you want to hard code the types, it would be better to use enum rules for DmsType and ProviderType. If these types should be flexible, you would use references to them in the MessageSourceConfig.

Further notes:
-its a bad idea to have white spaces in a keyword
"sends (a) message(s) {"
shold be
"sends" "(a)" "message(s)" "{"
-the convention is that only terminal rules are completely capitalised, that way, reading the grammar becomes easier.

Need training, onsite consulting or any other kind of help for Xtext?
Go visit http://xtext.itemis.com or send a mail to xtext@itemis.de

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Re: Beginner : Xtext help [message #699749 is a reply to message #699742]

Fri, 22 July 2011 08:50

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Hi,

you have static names so they are of course not unique if you use them twice.

but if you want to use them as enums why dont you declare them as enums

enum DMSTYPE:
TOPIC="topic" | QUEUE="queue";


enum ProviderType:
LOCAL="local" | SQLDMS="sqldms";

~Christian

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: Beginner : Xtext help [message #699792 is a reply to message #699749]

Fri, 22 July 2011 10:13

Arun

Messages: 26
Registered: July 2011

Junior Member

Thanks Christian!. Issue solved.

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